VulnerabilityPublished 28 May 2026Updated 6 Nov 2026

CVE-2026-46168: Linux kernel · mptcp: fix scheduling with atomic in timestamp sockopt

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ebeb70e29e37cfce899309cc2665a3bfe960ed94 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in ebeb70e29e37cfce899309cc2665a3bfe960ed94, e792cfb6aeaf65612cdf8e3ac431d65e66283654, b157dab93a7af44a84e78cf0cb311dde475cff5b +4

Exploitation evidence

Disclosed: evidence found.
CVE published 28 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 9061f24bf82ec2e92dd1e7c10b98b680db023d31, < ebeb70e29e37cfce899309cc2665a3bfe960ed94	Fixed in ebeb70e29e37cfce899309cc2665a3bfe960ed94
LinuxLinux	Affected ≥ 9061f24bf82ec2e92dd1e7c10b98b680db023d31, < e792cfb6aeaf65612cdf8e3ac431d65e66283654	Fixed in e792cfb6aeaf65612cdf8e3ac431d65e66283654
LinuxLinux	Affected ≥ 9061f24bf82ec2e92dd1e7c10b98b680db023d31, < b157dab93a7af44a84e78cf0cb311dde475cff5b	Fixed in b157dab93a7af44a84e78cf0cb311dde475cff5b
LinuxLinux	Affected ≥ 9061f24bf82ec2e92dd1e7c10b98b680db023d31, < b5c52908d52c6c8eb8933264aa6087a0600fd892	Fixed in b5c52908d52c6c8eb8933264aa6087a0600fd892
LinuxLinux	Affected ≥ 9061f24bf82ec2e92dd1e7c10b98b680db023d31, < 0949d8bbbedbafe0136a1723c41eb823c2f1e09d	Fixed in 0949d8bbbedbafe0136a1723c41eb823c2f1e09d
LinuxLinux	Affected ≥ 9061f24bf82ec2e92dd1e7c10b98b680db023d31, < 8a005fe451c73fd2b3d1faa5643c11e6bd07acfc	Fixed in 8a005fe451c73fd2b3d1faa5643c11e6bd07acfc

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix scheduling with atomic in timestamp sockopt Using lock_sock_fast() (atomic context) around sock_set_timestamp() and sock_set_timestamping() is unsafe, as both helpers can sleep. Replace lock_sock_fast() with sleepable lock_sock()/release_sock() to avoid scheduling while atomic panic.

References

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